What is a Theodolite?

A theodolite is a surveyor’s best friend and can be used for a number of different purposes. Surveyors have to make precise measurements of different areas for the purposes of engineering, construction, and cartography. So, it’s an important instrument for people in this line of work -- primarily because of its accuracy. It can measure horizontal and vertical angles. But it can also locate points along a line, which can be used to determine differences in elevation.

The digital theodolite is a standard in this day in age. It works by combining optical plummets, a spirit (similar to a spirit level), as well as a series of graduated circles that can be used to find horizontal and vertical angles. The plummet makes sure the instrument is placed exactly above the survey point, while the spirit makes sure it’s level. The graduated circles (one horizontal and one vertical) are used by the surveyor to measure the angles.

How to Use a Theodolite

You can use a theodolite by following these steps:

Mark the point at which it will be set up with a surveyor’s nail or stake.
Put the tripod legs into the ground while making sure it’s at eye level. This will make sure the measurements can be taken accurately.
Make sure the center of the mounting plate is directly above the nail or stake, and screw the instrument on the tripod.
Measure the height between the ground and the theodolitefor reference to where it will be set up later on.
Adjust the legs until you’re completely level on the horizontal by using the “bull’s eye” level and fine-tuning knobs.
Once it’s set up horizontally, keep making adjustments to the vertical plane by using the vertical plummet on the bottom of the instrument.
Aim the crosshair in the viewing scope at the point that needs to measured. Use the knobs to keep the theodoliteaimed at that point.

Once you complete these steps, the horizontal and vertical angles are ready to be recorded.

Features of the Topcon DT-200/200L Digital Theodolite

The Topcon DT-200/200L Digital Theodolite has several important features, which include:

Waterproof— This theodolite can be used in “wet weather” conditions, which can be encountered on the job site. So, you will never experience any downtime on the job site because of bad weather. It has an IP66 Rating, so the enclosure is protected from powerful jets of water without any harmful effects.
Data Output— It has the RS232C Serial Signal Port, which will allow you to connect to data collectors and computers.
Layout Laser— It has a 633nm diode laser that can be seen up to 50 meters away, even if it’s used outside in the daylight.
Tilt Sensor— This feature with Vertical Angle Correction makes sure your results are of the highest accuracy.
Compact and Lightweight— It’s extremely compact for its size with a weight of only 4 kg, which gives it more portability.

It also has the following accessories:

Diagonal eyepiece.
Solar reticles.
Carrying handle.
Trough compass.
Optical roof plummet (except for the DT-200L).

If you’re ready to pick up this digital theodolite, be to visit Engineer Supply today!

Frequently Asked Questions

What is the principle behind a theodolite?

A theodolite is a precision optical instrument that can be used for measuring angles between designated points along the horizontal and vertical planes. It has been traditionally used for land surveying, but they’re also used extensively for building and infrastructure construction. It can also be used for certain specialized applications (such as meteorology and rocket launching).

What is a theodolite used for?

Since it was invented in the 16th Century, it has been used to measure horizontal and vertical angles. But modern theodolites also have a mounted telescope that can swivel both horizontally and vertically. It can be leveled with a spirit, while the crosshairs on the telescope allow for the accurate alignment of the sighted object. And once the telescope has been precisely adjusted, the two scales (horizontal and vertical) can be read.

Can a theodolite measure distance?

Surveyors have to make precise measurements within a specific area, and the theodolite is one of the most accurate instruments because of its ability to measure angles along the horizontal and vertical planes. They can also be used to locate points on a line, which can be helpful in determining differences in elevation.

How accurate is a theodolite?

A theodolite is one of the most accurate instruments in surveying, because it can measure both horizontal and vertical angles with a great deal of precision. That’s why it's one of the most important tools for surveyors who need to make precise measurements for the purposes of engineering, construction, and map-making.

Where can I buy a quality theodolite?

Whether you’re looking for a digital theodolite or some other tool used for surveying, you can find what you need at Engineer Supply. We have a variety of tools that can be used for surveying, architecture, construction, and engineering. So if you’re ready to find a tool you can use on your next project, be sure to look at what we have in stock.